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5 Sheets- Sheet Patented Mar. 5, 1895.

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A. G. STEAM GrENEELA'IORI (No Model.)

(No Model.) A. G..MUMFORD. STEAM GfELIERJvIoRI4 4`No. 535,068. -Pate'nt'ed'MaJrf 1895.

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(No Model.) I 4 5 Sheets--Slieet 3. A. G. MUMFORD. STEAM GENERATOR No; 535,068. Patented Mar. l5, 1895.

INVENTORI (No Modem 5 sheetssheen 5.

A. G. MUMFORD.

STEAM GENERATOR.

vNo. 535,068. Pa..1;emtel Mam, 1895.

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Unire 'rares 'ArnNr Fries@ ARTHUR GEORGE MUMFORD,

OF COLCHESTER, ENGLAND.

STEAM-GENERATOR.

SPECIFICATION forming part or" Letters Patent N o. 53 5,068, dated March 5, 1895. Application lcd February 14,1894. Serial No. 500,160. (No model.) Patented in England May 1, 1893, Nou 8,729.

.To all whom t may concern,.-

Beit known that I, ARTHUR GEORGE MUM- FORD, a subject of the Queen of Great Britain, residing at Colchester, in the county of Essex, England, have invented a new and useful Improvement in Steam-Generators, (for which I have obtained a patent in Great Britain, No. 8,729, bearing date of May 1, 1893,) of which the following is a specication.

This invention relates to an improvement' in that type of water tube boilers having a steam collector and two water chambers, the latter each connected to the former by a series of small tubes and one or more circulating pipes, and it consists in arranging the said water tubes in groups to form self-contained elements by connecting their ends to two boxes which are connected respectively with the steam collector and water chambers by single pipes litted with flanged or other suitable joints, the said boxes respectively being arranged side by side to form the top and sides of the lire box or furnace, the object being to facilitate the repair of the boiler in case of accident to any of the tubes. I attain this end in the manner shown by the accompanying drawings which illustrates a boiler adapted for marine purposes.

Figure l, Sheet No. Lisa view in front elevation of my improved boiler, one halt' being in section. Fig. 2, Sheet No. 2, is a broken view in side elevation of the front part of the boiler. Fig. 3, Sheet No. 3, is a broken View in side elevation-partly inf section-of the back part of the boiler, and Fig. 4, Sheet No. 4, and Fig. 5, Sheet No. 5, are views--on a reduced scale-showing a double-ended boiler constructed according to my invention.

Throughout the views, A designates the steam collector; B, the water chambers; C, the boxes forming the upper part of the lire box; C', the boxes forming the sides of the fire box; D,- the group of tubes connecting eachof the boxes G with its adjacent box O; E, the single tubes connecting the boxes C with the steam collector or reservoir A; E', the single tubes connecting the boxes C with the chambers B; F, the circulating tubes connecting the steam collector A with the water chambers B; G, the re box or furnace; H, the bridge; J, the doors or plates inclosing the spaces between the boxes C and C, and K the uptake or funnel.

The boxes C and C are arranged in two rows side by side in contact with each other as shown by Figs. 2, 3, and 5and they are each provided with a suitable cover c, or c. Each of the boxes C on each side of the boiler is connected with the adjacent box C by a group of curved tubes D, the said tubes being of such a curvature that they can readily be Withdrawn or inserted through one or other of the said boxes after the removal ofthe cover thereof. It will thus be seen that one box C, one box C', and one group ot' tubes D forms a self-contained element.

Each of the boxes C is connected with the steam collector or reservoir A by means of a pipe E, and each ot' the boxes C is connected with the adjacent water chamber B by means of a pipe E. In any suit-able position in each of the pipes E and E are flanged joints c and c respectively. These joints are of the ordinary type and their functiony is to provide a means of disconnecting any one of the elements so that it can be readily removed and replaced. A boiler may be made up of any number of elements.

The pipes E and E connecting the boxes C and C with the steam collector A and water chambers respectively may run into or be connected to the covers of the said boxes, but they are preferably arranged to run into or to be connected to the boxes themselves so asl to leave the covers thereof free for removal without breaking the joints e or e.

In the construction shown by the accompanying drawings which illustrate a boiler specially adapted for marine purposes the elements are made of such a size andare so arranged that they can be removed from or introduced into their places through the fire box, but it will be obvious that in boilers not intended to be used in such confined spaces as necessitates the removal and introduction of the elements through the lire box, the elements may be made of any size and the tubes D connecting the two boxes of each element may be of any shape to obtain the greatest amount of heating surface, without departing from the principle ofv my invention.

The steam collector or reservoir A is con- IOO nected with the water chambers B and B by means of one or more circulating pipes F. In a single boiler two such pipes are used and they are preferably arranged at the front end of the boiler as shown by Figs. 1 and 2, but in a double-ended boiler they are preferably arranged between the two parts of the boiler as shown by Figs. etand 5. When two circulating pipes are used as shown by Figs. 1 and 2, I sometimes connect the two chambers B and B together at the back end of the boiler by a pipe such as b.

The steam collector or reservoir A is pro` vided with any suitable type of safety valve, stop valve or regulator, and pressure gage.

The furnace Gis provided with a door g and any suitable arrangement of lire bars, and the bridge II is preferably made of a sufficient height to pass up between the groups of tubes of the last two elements at the back end of the boiler, though it may be arranged in any other manner to suit the fire grate and the position of the exit of the hot gases.

The space between the edges of each ofthe boxes C and C and also between the two rows of boxes C, when they are not placed in contact with each other, are closed by suitable doors or plates J, and the front and rear ends of the boiler and also the lower part forming or inclosing the ash-pit are of the usual sheet iron or plate work L, suitable doors being formed at the sides or ends of the boiler for giving access to the tubes D for the purpose of sweeping their exterior surfaces.

The uptake or funnel K may be arranged either at the front end of the boiler, at the back end thereof as shown by Figs. l and 3, or at the center thereof as shown by Figs. Ll and 5, as found most convenient in practice.

The following are some of the advantages claimed for this construction of boiler: first increased heating surface owing to the great width of the fire grate obtainable; second, ease with which deficiency of boiler power can at any time be overcome by the addition of further elements; third, easy removal and replacement of any defective elements; fourth, perfect freedom for the expansion and contraction of the tubes; fifth, facility with which boilers of any power can be constructed by mere duplication of parts.

I wish it to be particularly understood that I do not limit myself to the precise details of construction hereinbefore described and illustrated by the accompanying drawings, but that I hold myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

I am aware that prior tothe date of my invention steam generators or boilers have been constructed which consist essentially of a steam collector and two water chambers or vessels each connected with the steam collector by means of tubes and circulating pipes, and I do not therefore claim such broadly as my invention, but

What I do claim, and desire to secure by Let-u ters Patent, is-

1. In a steam generator having a steam collector and two water chambers the latter being connected to the former by groups of small tubes and one or more circulating tubes, the combination with the said steam collector and water chambers of a series of boxes C and C arranged in pairs to form the top and sides of the fire box each pairof boxes carrying a group of small tubes D and having removable covers or lids c and c, as and for the purpose set forth.

2. In a steam generator having a steam collector and two water chambers the latter being connected to the former by a series of small tubes and one or more circulating pipes, the combination with the said steam collector and water chambers of a series of boxes C having removable covers or lids c and arranged in two rows to form either the whole orapart of the top of the firebox or furnace, of a series of boxes C having removable covers or lids c and arranged in two rows each adapted to form either the whole or a part of one of the sides of the rebox or furnace, of groups of curved tubes D connecting each of the boxes C with its adjacent box C the said tubes being of such a curvature that they can be withdrawn and inserted through the openings in the said boxes closed lby the covers or lids c and c respectively, asset forth.

3. In a steam generator having a steam collector and two water chambers the latter being connected to the former by a series of small tubes and one or more circulating pipes, the combination with the said steam collector and water chambers of a series of boxes C having removable covers or lids c and arranged in two rows to form either the whole or a part of the top of the irebox or furnace, of a series of boxes C having removable covers or lids c and arranged in two rows each adapted to form either the whole or a part of one of the sides of the firebox or furnace, of groups of curved tubes D connecting each of the boxes C with its adjacent box C', of pipes E each connecting one of the boxes C with the steam collector, and of pipes E each connecting one of the boxesC with one of the water chambers, as and for the purpose set forth.

4. In a steam generator having a steam collector and two water chambers the latter being connected to the former by a series of small tubes and one or more circulating pipes, the combination with the said steam collector and water chambers of a series of boxes C having removable covers or lids c and arranged in two rows to form either the whole or a part of the top of the rebox or furnace, of a series of boxes C having removable covers or lids c' and arranged in two rows each adapted to form either the whole or a part of one of the sides of the firebox or furnace, of groups of curved tubes D connecting each of the boxes C with its adjacent box C', of pipes E each connecting one of the boxes C with the IOO IIO

steam collector, and of pipes E each connecting one of the boxes C with one of the water chambers each of the said pipes having a joint such as e and e respectively, as and for the purpose set forth.

5. In a steam generator, the combination of the steam collector A; of the Water chambers B; of the circulating pipes F; of the elements each consisting of a box C, a box C', and a group of tubes D; and of the connecting pipes E and E each provided with a joint such as e and e respectively, as and for the purpose set forth.

`6. In asteam generator, the combination of the steam collector A; of the Water chambers doors or plates J, of the pipes E each having zo a anged joint e; of the pipes E each having a flanged joint e; ofthe Iirebox or furnace G, and of the uptake or funnel K; all combined arranged and adapted to operate substantially as hereinbefore set forth.

ARTHUR GEORGE MUMFORD.V i

Witnesses:

A. I-I. WYATT, F. H. NOBLE,

Both of Colchester. 

